Boiler and furnace grate



M. L. FOOTE AND W. M. KlNGSB URY.

, BOILER AND FURNACE GRATE; APPLICATION FILED APR. 9. 1920,

1 4 1 4 7 32 Patented May 2, 1922.

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MOSES L. rooms AND WILLIAM M. KINGsBURnos CL VE AND, c111 BO ILER AND-FURN=AGE GRATE.'

' Application filed. April 9,

T 0 all whom it may concern Be it known that we, Mosns L; Foo'rn and l/VILLIAM M. KINGSBUR citizens of the United States, residing at Cleveland, in the county of Cuyahoga and State-of Ohio, have invented certain new and useful Improvements in Boiler and Furnace Grates, of which the followingis a specificatlon.

This invention relates to grates'of a type somewhat similar to that for which we have obtained U. S. Patent #1316725 dated September 23, 1919.

In said patent there is disclosed a watercooled grate bar made substantially in one piece with inclined passages through the same communicating with a transverse header extending across the front of the fire box.

The present invention is an improvement on the grate bar referred to, the improvement consisting of various features as will more fully appear fromv the following description. 7

It may be said, however, that the present grate bar is built up of pipe sections connected at the rear by a return bend casting, and connected at the front to a header, the front connection being especially simple and convenient, and including a draw plate and a single bolt which connects the bar to the header, with slip nipples, permitting the connection to expand and contract at all angles. These'features will receive further description below.

In the accompanying drawings Fig. 1 is a side elevation of the grate bar with the header and fire box wall in section. Fig. 2 is a front elevation of the header. Figs. 3 and 4 are details of one of the draw plates. Figs. 5 and 6 are details of one of the front connections. Figs. 7 8 and 9 are details of the rear end bend. Fig. 10 is a detail of the bridge between the tubes.

The grate bars are set in through an elongated opening in the front wall 6 of the fire box, and are all connected to a header 7 having upper and lower circulation passages 8 and 9 with inlet and outlet'connections 1O andll at the end for the water circulation. V

Each grate bar consists of an upper tube -12 and a lower tube 13 which are setIat an angle to each other, or converging to r the rear, where they are tapped into a return bend casting 14 which has on its rear sidea lug 15 adapted to rest on .a'ledge 16 Specification of Letters Palient.

Patented May 2,1922.

[1920. Serial Np. :372,544.

or other rear support. The bends have spacmg lugs'17 to space the bars apart a proper distance. At the front end each of the tubes 12 and 13 extends through a hole in the draw plate 18, these plates being of proper size and shape to space the'bars apart and to fit and fill the opening in the front wall 6 0f the fire box. Each tube is screwed into a head connection 19, on the outside of the draw plate, and each connection receives one end of a tapered slip nipple 20, the other end of which fits into an opening at 21 in the rear wall of the header, and communicates with the appropriate passage therein.

The header has a cored opening at 22 in the partition between the passages to receive a bolt 23 which connects the header and the draw plate. The head of the bolt sets in a countersunk recess 24 in the back of the draw plate, the front of which stops against the fittings 19 which rest on lugs 25 formed on the face of the draw plate,

sion at various angles, the single bolt serving to pull both ofthe joints to contact with the transverse header, and the draw plates form a stop-off to close the opening inthe front of the fire box and to hold the bars in proper spacing. between the upper and lower tubes to form a support and to keep the bars in alignment. The whole forms a cheap and convenient assembly for a hollow grate bar, and any grate bar can be removed or inserted by simply disconnecting the bolt and removing the nipples and connections and then lifting the grate bar out through the fire box and front door of the furnace.

We claim: I

-1. The combination with a transverse header having passages therein, of a fire box having a front opening, and a plurality of grate bars eachhavln upper and lower tubes communlcatmg wit A bridge 30 is placed.

2. The combination with a fire box having an opening in its front wall, of a plurality of tubular grate bars theouter ends of which extend through 7 said opening, separate draw plates mounted upon the bars respectively, said draw plates fitting in and closing said opening, an external header I with which the grate bars communicate, and

connections between the header and the respective draw the header.

signatures in presence of two Witnesses.

MOSES L. FOOTE. WILLIAM M. KINGSB Witnesses: V 7

JOHN ABOMMHARDT, G. W. ROSENBERG.

UI- Y.

plates, to attach the bars to 10 

